Cheistophee aheens



(Nof Model.)

0. AHRENS.' PUMP4 VALVE.

Patvnted'Jan. 22,1884.

.To 1r/ZZ whom it muy concern.-

v UNITED Simms CHRISTOPHER AHRENS, OF CINCINNATI, OHIO, ASSIGNOR TO THE AHRENS MANUFACTURING COMPANY, OF SAME PLACE.

.PATENT OFFICE,

PU P-VALVE.

SPECIFICATION forming` part of Letters Patent No. 292,396, dated January 22, 1884.

Application filed June 2, 1883. V(No model.)

Be it known that I, CHRISTOPHER AHRnNs, of Cincinnati, in the county of Hamilton and State of Qhio, have invented certain new and useful` Improvements in Pump -Valves,vv of which the following is a speciiication.

My invention is in the nature of an improvement upon the metal springs employed for seating pump-valves, and has for its object the construction of such springs of a form calculated to secure a more uniform resistance to the lift ofthe valve as it rises from its seat than can beobtaincd with the springs for such purposesheretofore in use.

In the accompanying drawings, Figure l is an elevation of an ordinary pump-valve,with theY rubber disk shown-in section. an elevation, and Fig. 8 a plan, of my improved spring. Figs. 4 and 5 are elevations of the two general styles of springs for this purpose previously employed.

Similar letters of reference indicate similar parts.

A is the customary metal grate or seat for pump-valvesprovided with the fcentral spin' dle, B, which guides the valve or disk and limits the upward motion thereof by means of the collar b. f

C is the disk or valve, usually of rubber, as

shown in Fig. 1 and provided with the central orifice, which is large enough to permit the disk to slide freely up and down'the spindle B. I

D is my improved spring,`consisting oi' successive coils d d, from the lower or larger one of which the projection d enters a corresponding aperture in the rubber disk C, to prevent rubber.

As will be observed, the spring D is of several coils -of regularly-diminishing diameter from-the bottom to top, and the two upper or smaller coils, cl d2, are wound vthe one within vthe other, so as to occupy the same plane, and form a sea-t or 'shoulder to bear against the under side of collar b.

By reference to Fig. 3; the horizontal plan ofthe spring is-such that as it is compressed nig. 2 is bythe lift of the valve, as 'shown in dotted lines of Fig. 1, the several coils collapse in a ratio inversely as lthe diameters thereof, whereby the entire spring is brought into action for any degree of lift of disk C, and for any ordinary lift the increase in the resista-nce of the spring is inappreciable in practice.V Fig. 4 exhibits an ordinary spiral spring, which for the shortl length necessary `for this purpose, as shown by the space between the disk C and collar b of Fig. 1, which is an eX- act representation, full size, of a valve for the pump of a steam fire-engine, rapidly increases in power or resistance as the disk C rises from e its seat, and consumes (where there are many valves, as is usual in the construction of pumps at the present time) a large percentage of the engine-power in forcing the valve from its seat. Fig. 5 is an ordinary volute spring, the

i kind in most general use for seating `pump valves, and possessed, though in a smaller degree, of the .objectionable features of the spiral spring, Fig. 4, but lacking in the essential quality of springs for this purpose-viz., the uniformity of load imposed upon disk C for an ordinary lift or opening of valve.

The distinguishing difference in construction of my improved spring, Figs. 2 and 3, and the common volute spring, Fig. 5, is that in the former the two upper coils, d d2, are wound in the same plane, the latter within the former, while in the volute spring the figure in section is a true cone; nor am- I aware of the useA for any purpose of a spring such as I have described and shownin Figs.

, 2 and 3. the spring from revolving on and-chang the I am aware that springs for seating Ipumpvalves are in common use, and that springs as shown in Figs. 4-and 5 are old and well kno-wn in the arts. These'I do not claim.

Having described my invention,whatI claim The combination of a valve-seat, A, having the central spindle, B, provided with the stationary collar b, and the valve C, arranged to rise and fall on the spindle, with the spring D, composed of the successive coils d, of uniformly-diniinishing dia-meter from the base, In testimony whereof I have signed my the extremity of the lower coil having the name to the foregoing specification in the presprojeetion d entering an aperture in the valve, ence of two subscribing Witnesses.

and the two upper coils Wound one Within CHRISTOPHER AHRENS. 5 the other around the spindle, to oeeupy the i Vitnesses:

same horizontal plane and bear against lthe JOHN W. HILL,

collar, substantially as described. l JOSEPH XV. SIMS. 

